Hi Ufuk, Thanks for the details.
Could you please share which Lucene/Solr version you are running, and the full stack trace if you have it? Also, if you can reproduce this again, could you try running with assertions enabled? The assertions just above the failing line should print useful debug information. Thanks, Egor On Fri, 26 Jun 2026 at 15:22, Ufuk YILMAZ via java-user < [email protected]> wrote: > I've debugged a weird error I'm getting from Solr, which turned out to > be coming from lucene. > > For a particular search (it doesn't happen with other searches as far as > I could see), during the facet calculation (DocValues facet), at this > line: > > > https://github.com/apache/lucene/blob/f965e930673c1f5cb478dc6a8907f5fc4ef7b539/lucene/core/src/java/org/apache/lucene/util/FixedBitSet.java#L297 > > private int nextSetBitInRange(int start, int upperBound) { > // Depends on the ghost bits being clear! > assert start >= 0 && start < numBits : "index=" + start + ", > numBits=" + numBits; > assert start < upperBound : "index=" + start + ", upperBound=" + > upperBound; > assert upperBound <= numBits : "upperBound=" + upperBound + ", > numBits=" + numBits; > int i = start >> 6; > long word = bits[i] >> start; // skip all the bits to the right of > index > > "start" is 46536, "upperBound" is 46492 and "i" is 727: > > long word = bits[i] >> start; // skip all the bits to the right of index > > the above line throws an exception: > > java.lang.ArrayIndexOutOfBoundsException: Index 727 out of bounds for > length 727 > > I don't know if I can reproduce this error with a few documents and a > simple search, because it is pretty elusive. For example, if I just > reindex, the exception goes away. > > When I use another facet calculation algorihtm in Solr (e.g. "enum"), > the error goes away. It's only when docvalues is used. > > Could you point me in a direction to maybe better reproduce it with a > specific set of documents, or debug it better? > > --Ufuk > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
